Airplane



May 22, 1928.

' R. G. MILLER AIRPLQNE Patented May 22, 1928. I v 4 UNITED STATES PATENT OFFICE.

ROY G. MILLER, F BROOKLAWN, 'NEW JERSEY, ASSIGNOR 0F ONE-HALF T0 C. T.

L'UDINGTON, OF PHILADELPHIA, PENNSYLVANIA.

AIRPLANE.

Application filed December 23, 1925. Serial No. 77,230.

The principal objects of the present '1n- Upon release of either of the controls 2 and 55 vention are to give a stable characteristic to 3, the force of the springs 9 and 10, acting tbc airplane or, in other words, to prevent upon thc horns bythe extensions 12 and 13 movabley surfaces from flapping; to provide puts the movable surface 1 in neutral posi- 5 for the use ol extended movable surfaces tion with the lilies 6 and 7 in tension.

and in thatmway to improve the control of "lhe construction and mode of operation 60 the airplane; and to provide for keeping a of the modification shown in Figs. 2 and 3 movable surface, preferably balanced, in are as above described except that the exueutral position and to relieve the pilot by tension 12 is rigid and use is made of one ail'ording him liberty .of movement of his spring 15 instead of` two springs. The

' hands. spring 15 is inelosed in a housing and com- 05 Other objects of the invention will appear pressed between heads 16 and 17, movable, from the following description at the end of on the stem 18 of the extension between a which the invention will be claimed. nut 19 and a shoulder 2O in the housing, and In the followingr description reference will 16 between a shoulder 21 0n the extension be made to the accompanying drawing form- 12 and the cap 22 of the housing. lVhen 70 ing part hereof and in which the controls are released the parts occupy the Figure 1 is a view, largely diagrammatic positions shown in Figs. 2 and 3, the spring or schematic, of means embodying features by its compression or reaction placing and 20 of the invention. holding the part 1 in neutral or normal po- Fig. 2 is a similar view drawn to an cnsition. When control 2 is pulled, parts 19 76 larged scale and showing only the movable and 17 move towards the left further com surface and illustrating a modification, and pressing the spring against part 16 seated on Fig. 3 is a sectional view drawn to an enpart 22. l-Vhen control 3 is pulled, part 16 larged scale of one of the devices shown in impelled by shoulder 21 is moved towards Fig. 2. the right, spring l5 is further compressed on so In the drawing 1 is a hinged or pivoted part '17, part 20 acting as au abutment, the 'llIXlllal'y lIlOVlllO SlllflCC 21111111) iS SllOWIl nut 1S) 0f courge loves away fron) the as balanced. Referring more particularly part 17, to Fig. 1, 2 and 3 are control cables for the It will be obvious to those skilled in the movable surface 1. Thesecables 2 and are art to which the invention relates that modia connected with horns 4 and 5 attached to feations may be made in details 0f construethe movable surface 1, and by extensions tion and arrangement and mere matters of 12 and 13 with springs 9 and 10 connected form without departing from the spirit of with fixed positions 11, so that the springs the invention which is not limited as to such are' always active. The Springs are COIlmatters or otherwise than the prior art and m, nectcd to fixed positions S by lilies or cords the appended claim may require. 6 and 7 against which theisprings exert their I elailn; force so that when thel controlsv 2 and 3 are In an airplane a hinged or pivotal double 4o free, tbe force of the springs is exerted acting auxiliary movable surface, spring against the fixed positions 8, which. with the means operatively located to one side of the 5 lines (3 and T, and extensions 12 and 13, 0perpivot peint 0f the surface when in neutral ate to position the movable surface l in neuposition and constructed and arranged 4to tral position. If the pilot pulls, for examoperate intwo directions forgpositioning ple the control 2, he slacks off the control 3 said surface in neutral position, controls for with the result that the spring 9 is distended said surface fai-ranged to operate in oppoum and the line 6 and extension 13 are slack sition to said spring means, and sto eleened, so that the movable surface may be ments independent of the controls an actturned about its pivot 14 toward the top of ing directly on said springs and constructed the sheet. A reversal of the described operand arranged t0 resist their thrust only -OII takes Place When the Control 3 iS when the movable surface is in neutral posi- 105 pulled and the control 2 is slackened and in tion. that case the spring 10 is extended, and the extension 12 and line 7 are slackened. t ROY G. MILLER. 

